Calculating machines do sums better than even the cleverest people… As arithmetic has grown easier, it has come to be less respected.

I do not think any reasonable person can doubt that in India, China and Japan, if the knowledge of birth control existed, the birthrate would fall very rapidly

Nine-tenths of the appeal of pornography is due to the indecent feelings concerning sex which moralists inculcate in the young; the other tenth is physiological, and will occur in one way or another whatever the state of the law may be.

No matter how eloquently a dog may bark, he cannot tell you that his parents were poor, but honest.

No great achievement is possible without persistent work.

Adventurous men enjoy shipwrecks, mutinies, earthquakes, conflagrations, and all kinds of unpleasant experiences. They say to themselves, for example, 'So this is what an earthquake is like,' and it gives them pleasure to have their knowledge of the world increased by this new item.

It is preoccupation with possessions, more than anything else, that prevents us from living freely and nobly.